Reactions of Germenes with Some <i>para</i>-Quinones: Formation of a Tricyclic Compound from 1,4-Benzoquinone Undergoing an Unexpected Rearrangement
作者:Dumitru Ghereg、Erwan André、Sakina Ech-Cherif El Kettani、Nathalie Saffon、Mohamed Lazraq、Henri Ranaivonjatovo、Heinz Gornitzka、Karinne Miqueu、Jean-Marc Sotiropoulos、Jean Escudié
DOI:10.1021/om100113c
日期:2010.11.8
the model compound H2Ge═CH21H postulate that the first steps of its reaction with 1,4-benzoquinone are a double [2+2] cycloaddition between the Ge═C and C═O double bonds, leading to a transient dispiro compound containing two oxagermetane rings, followed by its isomerization to derivative 3H. Between 1a and 9,10-anthraquinone, a double [2+4] cycloaddition is observed involving the oxygens and the ortho-carbon
Germenes的Mes 2 Ge═CR 2 1A(MES = 2,4,6-三甲基苯基; CR 2 =芴基)和MES 2 Ge═CR' 2 1b中(CR' 2 = 2,7-二-叔-butylfluorenylidene)与反应1,4-苯醌和2,3,5,6-四甲基-1,4-苯醌,得到化合物1a,3b和5a,其包含1,4-环己二烯单元作为中心环。在乙醚或THF溶液中长时间存储后,化合物3a和3b发生双1,3-氢位移,从而导致其结构异构体4a和4b。理论计算模型上的化合物H进行2 Ge═CH 2 1H的Ge═C和C = O双键之间假设它与1,4-苯醌的反应的第一个步骤是一个双[2 + 2]环加成,从而导致到含有两个氧杂美满环的瞬态二螺化合物中,随后异构化为衍生物3H。在1a和9,10-蒽醌之间,观察到一个双[2 + 4]环加成反应,其中涉及一个相邻的芳族环系统的氧和邻碳原子,从而生成二氧杂二甲基苯并py衍生物2a。